Improve testing by defaulting auto-test framework to throw uknown proc exceptions.
Improve testing by defaulting auto-test framework to throw uknown proc exceptions.

Previously, the `unknown` prolog flag was setup to `fail`, so undefined
procedures would silently fail, rather then throw descriptive exceptions.

AppliedLogicSystems/ALSProlog,AppliedLogicSystems/ALSProlog,AppliedLogicSystems/ALSProlog,AppliedLogicSystems/ALSProlog,AppliedLogicSystems/ALSProlog,AppliedLogicSystems/ALSProlog,AppliedLogicSystems/ALSProlog,AppliedLogicSystems/ALSProlog,AppliedLogicSystems/ALSProlog